Moss is seen growing on a child's slipper in the ghost town of Pripyat which was evacuated after an explosion at the Chernobyl nuclear power plant, Ukraine April 18, 2016. For residents of Chernobyl, a three-day evacuation turned into a thirty-year exile. Returning to their hometown of Pripyat on the eve of the anniversary, they recall their confusion and sacrifice in the wake of the world's worst nuclear accident. In the morning of April 26, 1986, one couldn't immediately tell that a meltdown in reactor 4 of the nuclear plant in then-Soviet Ukraine was poisoning the air with deadly radioactive particles. REUTERS/Gleb Garanich SEARCH "RETURN PRIPYAT" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES

Moss is seen growing on a child's slipper in the ghost town of Pripyat which was evacuated after an explosion at the Chernobyl nuclear power plant, Ukraine April 18, 2016. For residents of Chernobyl, a three-day evacuation turned into a thirty-year exile. Returning to their hometown of Pripyat on the eve of the anniversary, they recall their confusion and sacrifice in the wake of the world's worst nuclear accident. In the morning of April 26, 1986, one couldn't immediately tell that a meltdown in reactor 4 of the nuclear plant in then-Soviet Ukraine was poisoning the air with deadly radioactive particles. REUTERS/Gleb Garanich SEARCH "RETURN PRIPYAT" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES